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qemu-helper-native: Re-write bridge helper as C program

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The bridge helper program is invoked directly from QEMU when it needs to
attach to a network bridge. As such, it is subject to the environment of
QEMU itself. Specifically, if bridging is enabled with direct rendering
acceleration, QEMU is run with an LD_PRELOAD that attempts to preload
several uninative libraries; however /bin/sh doesn't use the uninative
loader which means it can fail to start with an error like:

 /bin/sh: symbol lookup error: sysroots-uninative/x86_64-linux/lib/librt.so.1: undefined symbol: __libc_unwind_link_get, version GLIBC_PRIVATE

Converting the helper program to a C program resolves this problem
because it will now use the uninative loader so the preload doesn't
cause errors.

(From OE-Core rev: adabfbd9245553d1fb6abb050856e3da89f7a3d5)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit f698e98f2f09952b34488b8cf9e73e82bd7aea07)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Joshua Watt
2022-10-21 13:14:51 -05:00
committed by Richard Purdie
parent d0a6b10496
commit 39e2c09f4a
3 changed files with 44 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
meta/recipes-devtools/qemu/qemu-helper-native_1.0.bb
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@@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://${WORKDIR}/tunctl.c;endline=4;md5=ff3a09996bc5fff6bc5
SRC_URI = "\
file://tunctl.c \
file://qemu-oe-bridge-helper \
file://qemu-oe-bridge-helper.c \
"
S = "${WORKDIR}"
@@ -16,13 +16,13 @@ inherit native
do_compile() {
${CC} ${CFLAGS} ${LDFLAGS} -Wall tunctl.c -o tunctl
${CC} ${CFLAGS} ${LDFLAGS} -Wall qemu-oe-bridge-helper.c -o qemu-oe-bridge-helper
}
do_install() {
install -d ${D}${bindir}
install tunctl ${D}${bindir}/
install -m 755 ${WORKDIR}/qemu-oe-bridge-helper ${D}${bindir}/
install qemu-oe-bridge-helper ${D}${bindir}/
}
DEPENDS += "qemu-system-native"

25
meta/recipes-devtools/qemu/qemu-helper/qemu-oe-bridge-helper
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@@ -1,25 +0,0 @@
#! /bin/sh
# Copyright 2020 Garmin Ltd. or its subsidiaries
#
# SPDX-License-Identifier: GPL-2.0
#
# Attempts to find and exec the host qemu-bridge-helper program
# If the QEMU_BRIDGE_HELPER variable is set by the user, exec it.
if [ -n "$QEMU_BRIDGE_HELPER" ]; then
exec "$QEMU_BRIDGE_HELPER" "$@"
fi
# Search common paths for the helper program
BN="qemu-bridge-helper"
PATHS="/usr/libexec/ /usr/lib/qemu/"
for p in $PATHS; do
if [ -e "$p/$BN" ]; then
exec "$p/$BN" "$@"
fi
done
echo "$BN not found!" > /dev/stderr
exit 1

41
meta/recipes-devtools/qemu/qemu-helper/qemu-oe-bridge-helper.c Normal file
View File

@@ -0,0 +1,41 @@
/*
* Copyright 2022 Garmin Ltd. or its subsidiaries
*
* SPDX-License-Identifier: GPL-2.0
*
* Attempts to find and exec the host qemu-bridge-helper program
*/
#include <stdio.h>
#include <unistd.h>
void try_program(char const* path, char** args) {
if (access(path, X_OK) == 0) {
execv(path, args);
}
}
int main(int argc, char** argv) {
char* var;
/* Copy arguments so that they are a NULL terminated list, skipping argv[0]
* since it is this program name */
char** args = malloc(argc * sizeof(char*));
for (int i = 0; i < argc - 1; i++) {
args[i] = argv[i + 1];
}
args[argc - 1] = NULL;
var = getenv("QEMU_BRIDGE_HELPER");
if (var && var[0] != '\0') {
execvp(var, args);
return 1;
}
try_program("/usr/libexec/qemu-bridge-helper", args);
try_program("/usr/lib/qemu/qemu-bridge-helper", args);
fprintf(stderr, "No bridge helper found\n");
return 1;
}